Question

Work is said to be done when:
(A). A force should act on an object, and therefore the object must be displaced
(B). No force should act on object, and the object must be displaced
(C). A force should act on an object, and the object must not be displaced
(D). No force should act on an object, and the object must not be displaced

Answer 1

- Hint: To understand the above question, we have to first learn about the work done. Work is defined as the force in the direction of displacement. It is a scalar quantity having S.I. unit Joule.

Complete step-by-step answer:
W = Fs, where F is that the component of force within the direction of displacement. No work is done in spite of working hard when: There is no displacement of objects. Example: a boy pushing a wall. Displacement is perpendicular to the object.
Now, from the given question—
Work is completed whenever the given condition is satisfied:
1. A force should act on an object. To understand this, consider an example of an object lying stationary on the table. If we will not apply any force on the object then there will be no change in its state, that is, the object will be in its state of rest.
2. There is a displacement of the body caused by the applied force along the direction of the applied force. Consider the above example, if we will apply force from the left side of the object towards the right side then the object must move towards the right side or vice versa.
Therefore, the option(A) is the correct answer.

Note: Work is the process of energy transfer to the motion of an object via application of a force, often represented as the product of force and displacement. A force is claimed to try to do positive work if (when applied) the force features a component within the direction of the displacement of the purpose of application. A force does negative work if the force features a component opposite to the direction of the displacement at the purpose of application of the force. When the force F is constant and the angle between the force and the displacement s is , then the work done is given by . Work transfers from one place to another, or one form to another. The other units of work are Foot-pound, Erg.
1 Joule is defined as the work expended by a force of one newton through a displacement of one meter.